So I always thought serum, then moisturiser, then foundation. I once bought some primer but haven't really used it because 4 layers of stuff on my face seems insane, and I don't know where it comes in the face-slap order. And then I was given some toner - where does that come in?
Now Sali Hughes here has baffled the hell out of me - whatever she's reviewing seems to be both a serum and a primer but she's putting it over her moisturiser.
Also - concealer first, then foundation? Or the other way round? I'm talking eye-bag concealer here.
Is there an ultimate guide out there somewhere?